1. Department of Physics, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
2. UFD, PAI, GEEA, ENSAI, University of Ngaoundere, Ngaoundere, Cameroon
3. Laboratory of Combustion and Green Technology, Department of Energy Engineering, UIT, University of Ngaoundere, Ngaoundere, Cameroon
4. Polytechnic School of Ouagadougou, Ouagadougou, Burkina Faso
5. National Higher Polytechnic School of Douala, University of Douala, Douala, Cameroon